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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c0e19d1fbb4c09fd6469f4c2958a219670dce44418463957c90b9a331ed483' 
  AND token = '0siuQW39U2j82PKD7r+1WVBrOdtODdca8bFtKSl8pM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}